Super Duper® Handy Handouts® a are FREE online, informational newsletters for teachers and parents. I love these handouts for a variety of reasons. Mostly because they are short, accurate, and cover a multitude of topics. I typically will use them to help build better understanding of what a student might need to parents and teachers.
They also have these other resources that are special education and Speech Therapist centric resources.
SLP Case History Form
Link: Other free resources
Super Duper also sells really good materials to support teaching discrete skills sets primarily around Speech and Language impairments. I find the pragmatic (social skills) materials to be especially helpful in working with students individually and in groups.